Daniel:
Mark has a very important point, especially given that you are driving a late model car. The post-Ford era Panteras lack the internal bracing within the rear frame rails that the earlier cars had, and so are prone to collapse. Charlie McCall had this happen, and was fortunate enough to catch it before the rear suspension tore out completely at an inopportune moment. If you choose to go with a brace system that does not act as reinforcement for the rear lower control arm attachment points, you really should invest in some other method of fixing the problem.
I will send you a collection of general information on chassis bracing directly via e-mail.
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